Extreme weather in Mexico is contributing to undocumented migration and return between Mexico and the United States.

Extreme weather caused by climate change has contributed to illegal migration at the U.S.-Mexico border, according to a new study. A study titled "Weather deviations linked to undocumented migration and return between Mexico and the United States ...

Extreme weather is a factor in driving both illegal border crossings from Mexico into the U.S. and whether migrants return to Mexico, according to new research published in the Proceedings of the National Academy of Sciences (PNAS).